Aligning-pole



(NbModeL) F. DANFORTH.

ALIGNING, POLE.

No. 355,303. Patented Jan. 4, 1887.

WHMMM 3 A v M 3 lfl Jh M- UNIT D STATES PATENT Fries.

FBEDERIO DANFORTH, OF GARDINER, MAINE.

ALIGNlNG-POLE.'

SPECIFICATION forming part of Letters Patent No. 355,303, dated January 4, 1387.

Application filed September 6, 1886. Serial No. 212,815. (No model.)

To all whom it may concern:

Be it known that I, FREDERIO DANFORTH, a citizen of the United States, residing at Gardiner, in the county of Kennebec and State of Maine, have invented certain new and useful Improvements in Aligning-Poles; and I do hereby declare the following to bea full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to appliances for surveying; and it consists of an alignment or transhod with iron, have been used, and it has been the common practice among engineers and land-surveyors to use such painted poles for alignment, and where measurements over uneven ground were requiredto use a plumbbob. The use of an "aligning-pole without some means of plumbing the same has always been the cause of errors, for when the top of the pole only was visible from the instrument the point or shoe might not be vertically under the line of sight. In making measurements over rough or uneven ground, where a considerable degree of accuracygvas required, it hasbeen the general custom to use a plumbbob, which was suspended from the end of the tape. To use a plumb-bob for this purpose requires considerable skill and practice, and in windy weather and on very rough ground there is considerable difficultyin doing good work.

By the use of my device I am enabled to dispense with the use of the plumb-bob, using the same instrument both for running lines and making measurements.

that the center line is plainly visible.

Fig. 3 is an enlarged part sectional B is a pointed metal shoe, preferably with a steel point.

D is a level-bulb inserted in a hole bored laterally in the pole. and so adjusted that when the bubble d is in the center of the opening 0 the center of the face of the pole will be vertical.

G G are metal fish-plates attached to the edges of the pole opposite the opening 0, to suitably strengthen the pole at this point.

The level-bulb D may be secured in place by putty or plaster-of-paris, or in any suitable manner; or it may be arranged with adjustingscrews. When placed in the body of the pole as described, with the strengthening-pieces attached firmly to the edges of the pole, the bulb is comparatively free from danger of breakage, even when the pole is roughly used, the plates 0 O rendering the pole perfectly rigid at that point.

In constructing my pole I usually bore the hole containing the bulb a trifle large, to allow for the proper adjustment of the level.

The use of my device is evident from its con struction. held toward the instrument, the point of the shoebeing always vertically under every point in the center of the face of the pole. Whena measurement is to be made, the pole is simply In running lines, the fiat face is turned ninety degrees, its fiat face extending I ICO strengthening-plates attached to said pole opsorted into the body of the pole, an opening posite the said opening, substantially as and in the pole through which said bulb can be for the purpose set forth. i seen, and a pointed metal shoe secured to the 2. An aligningpole having a levelbulb in bottoxnof said pole, substantially as described, 5 serted in the body of the pole, an opening in In testimony whereofI aflix my signature in 15 the pole through which the bulb can be seen, presence of two witnesses. and strengthening-plates secured to the pole FREDERIO DANFORTH. opposite said opening, substantially as and for Witnesses: the purpose set forth. HENRY S. WEBSTER. l0 3. An aligning-pole having a level-bulb in- I A. T. SOHUMAN. 

